помогите срочно 3(3,4)

3) 4у^3+8y^2-y=2
y(4y+8)^2-y=2
4y+8-y=2
3y=-4
y=-3/4
4) 12x^2-8x^3+2x = 3
x(12-8x)^2+2x = 3
-6=-6
x= -1